235 Dominican Fossils — Maury 121 



more or less obsolete, wavy ridges tending to alternate with spiral 

 threads. Columella with a thick wash of callus, canal strongly 

 re flexed. Length 94, width 55 mm. 



Our fossil resembles the recent 5. (Mouodactylus) gallus 

 Linne. But on comparing it with specimens of gallus from Tor- 

 tola, the latter is seen to have a much narrower spire, with tuber- 

 c les absent from the two whorls preceding the last then reappear- 

 ing, and the body is strongly spirally sculptured. 



Locality. — (Exp'd '16) Bluff 1, Cercado de Mao. 



Genus Orthaulax Gabb 



Orthaulax inornatus Gabb 



Plate 21, Figure 11 



Orthaulax inornatus Gabb, Proe. Acad. Nat. Sci. Phila., vol. 24, p. 



272, pi. 9, figs. 3, 4, 1872; Trans. Amer. Phil.Soc, vol. 15, p. 235, 



1873- 

 Orthaulax hi orn atu s Guppy, Quart. Jour. Geol. Soc, London, vol. 32, 



p. 520, 1876. 

 Orthaulax inornatus Dall, Trans. Wagner Inst. Sci., vol 3, pt. 1, p. 169, 



1890: Bull. 90, U. S. Nat. Mus., p. 86, pi. 11, fig. 4, 1915. 



The genus Orthaulax occurs in Santo Domingo, Cuba, An- 

 tigua, Tampa silex beds, Bainbridge (Georgia), lower bed of 

 Alum Bluff, and the Chipola marls, Florida. It has not been 

 found in the Bowden beds. 



Gabb's species, O. inornatus is the genotype described from 

 Santo Domingo. Dr. Dall has found it in the White Beach 

 limestone and the Tampa silex bed, Florida. 



Genus Crepitacella Guppy 



Crepitacella cepula Guppy 



Plate 21, Figure 9 



Melanopsis cepula Guppy, Quart. Jour. Geol. Soc. London, vol. 22, p. 



580, pi. 26, fig. 14, 1866. 

 Crepitacella cepula Guppy, Geol. Mag. London, vol. 4, p. 500, 1867. 

 Dolophanes melanoides Gabb, Proc. Acad. Nat. Sci, Phila., vol. 24, p. 



273, pi. 11, fig. 7, 1872. 



